Air inlet cavity of engine

Abstract

An engine air inlet cavity comprises an air inlet cavity body, a top cover is arranged on the air inlet cavity body, a first air filter is arranged on the left side of the top cover, and a second air filter is arranged on the right side of the top cover. The lower end of the air inlet cavity body is connected with an engine. Due to the design of the two air filters, it can be guaranteed that the air inflow is sufficient, and meanwhile impurities, dust and particulate matter in air can be effectively filtered out; a channel network composed of labyrinth type partition plates is arranged in the air inlet cavity body, and oil-gas separation is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an engine intake cavity. Background Art

[0002] The engine intake cavity is a key part of the engine intake system. Its main function is to provide clean, dry, sufficient and stable air for the engine to meet the normal operation requirements of the engine. The intake cavity effectively filters out impurities, dust and particulate matter in the air through the internal air filter assembly, ensuring that the air entering the engine is clean and preventing impurities from causing wear or damage to the internal parts of the engine. The intake cavity and its related components (such as air flow meter, throttle valve, etc.) work together to adjust the intake air volume according to the engine's needs, ensuring that the engine can obtain a stable air supply under different working conditions. When the engine is working, the driver controls the opening of the throttle valve through the accelerator pedal, thereby changing the intake air volume. The air entering the engine first passes through the air filter to filter out impurities and dust, then flows through the air flow meter to measure the flow rate, and then enters the intake manifold through the throttle valve. The intake manifold distributes the air to each cylinder, mixes it with the fuel sprayed by the fuel injector and ignites it to generate power to drive the engine to operate. When the engine is working, due to the gaps between the cylinder wall and the piston and piston ring, part of the mixed gas (including fuel, engine oil, water vapor, etc.) will enter the crankcase. In order to reduce the consumption of engine oil and the pollution of the intake system, it is necessary to separate the oil and gas, and the relatively clean gas continues to enter the intake system to participate in combustion. The existing intake cavity cannot effectively filter out impurities, dust and particulate matter in the air while separating the oil and gas.

[0003] A four-cylinder engine intake cavity structure with the publication number of CN210289969U in the prior art discloses a four-cylinder engine intake cavity structure, including an intake cavity with a T-shaped cross-section. Four air outlets are symmetrically arranged in pairs on both sides of the bottom of the intake cavity, and the air outlets are vertically downward. An intake supercharging interface is opened at the front end of the intake cavity, which is used to communicate with the supercharger outlet pipeline. The intake cavity is also provided with a first air vent connected to the high-pressure air pump of the engine and a second air vent connected to the supercharger. The engine intake cavity structure proposed by the utility model has a compact structure, light weight and high pressure resistance, and can stably provide intake air for the engine under high pressure. In addition, the utility model has four-cylinder gas pressure stabilization, can also transmit the internal pressure signal of the intake cavity to the vehicle's ECU, and provide air source for the high-pressure air pump and balance signal for the supercharger. This technical solution fails to effectively filter out impurities, dust and particulate matter in the air while separating the oil and gas. Summary of the Utility Model

[0004] When the existing engine intake cavity is working, due to the gaps between the cylinder wall and the piston and piston rings, some of the mixture gas (including fuel, engine oil, water vapor, etc.) will enter the crankcase, and it cannot effectively filter out impurities, dust, and particulate matter in the air while separating oil and gas.

[0005] To solve the above technical problems, the technical solution adopted by the present utility model is as follows: An engine intake cavity, including an intake cavity main body, a top cover is provided on the intake cavity main body, a first air filter is provided on the left side of the top cover, and a second air filter is provided on the right side; the lower end of the intake cavity main body is connected to the engine through an intake pipe.

[0006] Preferably, the intake cavity main body includes an intake cavity upper cover and an intake cavity lower cover which are snap-connected, and the intake cavity main body is connected to the top cover through an intake throat pipe. The left side of the top cover is directly connected to the first air filter, the right side is directly connected to the second air filter, and a negative pressure valve is provided at the bottom of the top cover. The first air filter and the second air filter have the same structure and are symmetrically arranged. The snap-connection design facilitates installation, disassembly, and cleaning.

[0007] Preferably, the right side of the first air filter is integrally connected to the top cover, an intake partition is provided on the left side and fixed with bolts, a filter screen is provided on the intake partition, and the filter screen is integrally connected to the intake partition. The left side of the second air filter is integrally connected to the top cover, an intake partition is provided on the right side and fixed with bolts, a filter screen is provided on the intake partition, and the filter screen is integrally connected to the intake partition. The design of the two air filters can ensure sufficient intake air volume while effectively filtering out impurities, dust, and particulate matter in the air. The integrally connected filter screen and intake partition facilitate installation, disassembly, and cleaning, and the integral design of the top cover and the air filter facilitates production and installation.

[0008] Preferably, a labyrinth partition is provided on the intake cavity lower cover, a bellmouth pipe is provided on the intake cavity lower cover to connect the intake pipe, and the intake pipe directly communicates with the engine. When the engine is working, due to the gaps between the cylinder wall and the piston and piston rings, some of the mixture gas (including fuel, engine oil, water vapor, etc.) will enter the crankcase. In order to reduce the consumption of engine oil and the pollution of the intake system, it is necessary to separate oil and gas so that the relatively clean gas can continue to enter the intake system to participate in combustion. A complex channel network is formed between the labyrinth partitions, so that the oil and gas mixture constantly changes direction when passing through, thereby increasing the chance of oil droplets hitting the labyrinth plate and realizing oil and gas separation. The separated gas enters the intake pipe through the bellmouth pipe and directly reaches the engine.

[0009] The beneficial effects of the present utility model are: The design of the two air filters can ensure sufficient intake air volume while effectively filtering out impurities, dust, and particulate matter in the air; a complex channel network is formed between the labyrinth partitions on the intake cavity lower cover, so that the oil and gas mixture constantly changes direction when passing through, thereby increasing the chance of oil droplets hitting the labyrinth plate and realizing oil and gas separation. Brief Description of the Drawings

[0010] Figure 1 This is the overall structure diagram of the present utility model.

[0011] Figure 2 This is the overall structure diagram of the back side of the present utility model.

[0012] Figure 3 This is the structure diagram of the lower cover of the intake cavity.

[0013] Figure 4 This is the structure diagram of the top cover.

[0014] Figure 5 This is the structure diagram of the upper cover of the intake cavity in Embodiment 3.

[0015] Figure 6 This is the structure diagram of the intake partition.

[0016] In the figure, 1 is the main body of the intake cavity, 2 is the top cover, 3 is the first air filter, 4 is the second air filter, 5 is the air inlet pipe opening, 6 is the upper cover of the intake cavity, 7 is the lower cover of the intake cavity, 8 is the intake throat pipe, 9 is the intake partition, 10 is the filter screen, 11 is the labyrinth partition, 12 is the horn pipe, 13 is the bolt fixing structure, 14 is the buckle fixing structure, 15 is the intake passage, 16 is the extended fixing plate, and 17 is the negative pressure valve. Detailed Description of the Preferred Embodiments

[0017] The present invention will be further described in detail below with reference to the accompanying drawings.

[0018] Embodiment 1: As shown in Figure 1 and Figure 2 , an engine intake cavity includes a main body 1 of the intake cavity. A top cover 2 is provided on the main body 1 of the intake cavity. A first air filter 3 is provided on the left side of the top cover 2, and a second air filter 4 is provided on the right side. An air inlet pipe opening 5 is provided at the lower end of the main body 1 of the intake cavity, and the air inlet pipe opening 5 is connected to the engine through an air inlet pipe. Air enters the top cover 2 from the air filter, then flows from the top cover 2 into the main body 1 of the intake cavity, and finally flows into the engine from the air inlet pipe.

[0019] As a further improvement of the present utility model, the main body 1 of the intake cavity includes an upper cover 6 and a lower cover 7 of the intake cavity that are snap-connected, and the main body 1 of the intake cavity is connected to the top cover 2 through an intake throat pipe 8. As shown in Figure 4As shown, the left side of the top cover 2 is directly connected to the first air filter 3, and the right side is directly connected to the second air filter 4. A negative pressure valve 17 is provided at the bottom of the top cover 2, and an intake passage 15 is provided at the lower end of the middle part of the top cover 2 to connect to the intake throat 8. The first air filter 3 and the second air filter 4 have the same structure and are symmetrically positioned. The snap-connected intake chamber upper cover 6 and intake chamber lower cover 7 facilitate installation, disassembly, and cleaning. Air enters the top cover 2 from the air filters on both sides, then enters the intake throat 8 through the intake passage 15, and flows into the intake chamber main body 1 to complete the preliminary filtration of the intake air. When the air pressure inside the top cover 2 is too high, the negative pressure valve 17 opens and the gas flows out from it.

[0020] As a further improvement of the present utility model, the right side of the first air filter 3 is integrally connected to the top cover 2, and an intake partition 9 fixed by bolts is provided on the left side. A filter net 10 is provided on the intake partition 9, and the filter net 10 is integrally connected to the intake partition 9. The left side of the second air filter 4 is integrally connected to the top cover 2, and an intake partition 9 fixed by bolts is provided on the right side. As Figure 6 shown, a filter net 10 is provided on the intake partition 9, and the filter net 10 is integrally connected to the intake partition 9. The design of the two air filters can ensure sufficient intake air volume while effectively filtering out impurities, dust, and particulate matter in the air. The integrally connected filter net 10 and intake partition 9 facilitate installation, disassembly, and cleaning. At the same time, the integral design of the top cover 2 and the air filter facilitates production and installation. Bolt fixing structures 13 are provided at both ends of the intake partition 9 for installing and fixing the intake partition 9 on the air filter.

[0021] As a further improvement of the present utility model, as Figure 3 shown, a labyrinth partition 11 is provided on the intake chamber lower cover 7, and a horn tube 12 is provided on the intake chamber lower cover 7 to connect to the intake pipe, and the intake pipe is directly connected to the engine. When the engine is working, due to the gaps between the cylinder wall and the piston and piston ring, part of the mixed gas (including fuel, engine oil, water vapor, etc.) will enter the crankcase. In order to reduce the consumption of engine oil and the pollution of the intake system, it is necessary to separate the oil and gas so that the relatively clean gas can continue to enter the intake system to participate in combustion. Complex channel networks are formed between the labyrinth partitions 11, so that the oil and gas mixture constantly changes direction when passing through, thereby increasing the chance of the oil droplets hitting the labyrinth plate to achieve oil and gas separation. The separated gas enters the intake pipe through the horn tube 12 and directly reaches the engine. The horn tube 12 is in the shape of a horn with a large front end and a small rear end, with the large end for intake and the small end for outlet, which can ensure that the gas after oil and gas separation flows out from it, while the oil droplets in the intake chamber are difficult to flow upstream into the horn tube 12.

[0022] Embodiment 2: As Figure 1 and Figure 2As shown in the figure, an engine intake cavity includes an intake cavity main body 1, a top cover 2 is provided on the intake cavity main body 1, a first air filter 3 is provided on the left side of the top cover 2, and a second air filter 4 is provided on the right side; an air inlet pipe port 5 is provided at the lower end of the intake cavity main body 1, and the air inlet pipe port 5 is connected to the engine through an air inlet pipe. Air enters the top cover 2 from the air filter, then flows from the top cover 2 into the intake cavity main body 1, and finally flows into the engine from the air inlet pipe.

[0023] As a further improvement of the present utility model, the intake cavity main body 1 includes an upper intake cavity cover 6 and a lower intake cavity cover 7 which are snap-connected, and the intake cavity main body 1 is connected to the top cover 2 through an intake throat pipe 8. As Figure 4 shown, the left side of the top cover 2 is directly connected to the first air filter 3, the right side is directly connected to the second air filter 4, a negative pressure valve 17 is provided at the bottom of the top cover 2, and an intake passage 15 is provided at the lower end of the middle part of the top cover 2 to connect to the intake throat pipe 8. The first air filter 3 and the second air filter 4 have the same structure and are symmetrically arranged. The snap-connected upper intake cavity cover 6 and lower intake cavity cover 7 are convenient for installation and disassembly and cleaning. Air enters the top cover 2 from the air filters on both sides and then enters the intake throat pipe 8 through the intake passage 15, and flows into the intake cavity main body 1 to complete the preliminary filtration of the intake air. When the air pressure inside the top cover 2 is too high, the negative pressure valve 17 opens and the gas flows out from it. The difference between this embodiment and the first embodiment is that the top cover 2 is divided into an upper shell and a lower shell, and the two are fixedly connected by snap-fasteners and bolts, which is convenient for production and installation.

[0024] As a further improvement of the present utility model, the right side of the first air filter 3 is integrally connected to the top cover 2, an intake partition 9 fixed by bolts is provided on the left side, a filter net 10 is provided on the intake partition 9, and the filter net 10 is integrally connected to the intake partition 9. The left side of the second air filter 4 is integrally connected to the top cover 2, and an intake partition 9 fixed by bolts is provided on the right side. As Figure 6 shown, a filter net 10 is provided on the intake partition 9, and the filter net 10 is integrally connected to the intake partition 9. The design of the two air filters can ensure sufficient intake air while effectively filtering out impurities, dust and particulate matter in the air. The integrally connected filter net 10 and intake partition 9 are convenient for installation and disassembly and cleaning, and at the same time, the integral design of the top cover 2 and the air filter is convenient for production and installation. Bolt fixing structures 13 are provided at both ends of the intake partition 9 for installing and fixing the intake partition 9 on the air filter.

[0025] As a further improvement of the present utility model, as Figure 3 shown, a labyrinth partition 11 is provided on the lower intake cavity cover 7, a bellmouth pipe 12 is provided on the lower intake cavity cover 7 to connect to the air inlet pipe, and the air inlet pipe is directly communicated with the engine. The difference between this embodiment and the first embodiment is that, as Figure 5As shown, the upper cover 6 of the intake cavity is also provided with a labyrinth partition 11. The labyrinth partition 11 on the upper cover 6 of the intake cavity corresponds to the labyrinth partition 11 on the lower cover 7 of the intake cavity up and down. After the upper cover 6 of the intake cavity and the lower cover 7 of the intake cavity are buckled and connected, they can be used for support and fixation to ensure the overall structural strength, and at the same time increase the sealing performance of the channel network formed by the labyrinth partition 11. When the engine is working, due to the gaps between the cylinder wall, the piston and the piston ring, part of the mixed gas (including fuel, engine oil, water vapor, etc.) will enter the crankcase. In order to reduce the consumption of engine oil and the pollution of the intake system, it is necessary to separate the oil and gas so that the relatively clean gas can continue to enter the intake system to participate in combustion. A complex channel network is formed between the labyrinth partitions 11, so that the oil and gas mixture constantly changes direction when passing through, thereby increasing the chance of the oil droplets hitting the labyrinth plate and realizing the separation of oil and gas. The separated gas enters the intake pipe through the horn pipe 12 and goes straight to the engine. The horn pipe 12 is in the shape of a horn with a large front end and a small rear end. The large end intakes air and the small end discharges air, which can ensure that the gas after oil and gas separation flows out from it, while the oil droplets in the intake cavity are difficult to flow upstream into the horn pipe 12.

[0026] Embodiment 3: As Figure 1 and Figure 2 shown, an engine intake cavity includes an intake cavity main body 1. A top cover 2 is provided on the intake cavity main body 1. A first air filter 3 is provided on the left side of the top cover 2, and a second air filter 4 is provided on the right side. An intake pipe port 5 is provided at the lower end of the intake cavity main body 1, and the intake pipe port 5 is connected to the engine through an intake pipe. Air enters the top cover 2 from the air filter, then flows from the top cover 2 into the intake cavity main body 1, and finally flows into the engine from the intake pipe.

[0027] As a further improvement of the present utility model, the intake cavity main body 1 includes an upper cover 6 and a lower cover 7 of the intake cavity that are buckled and connected, and the intake cavity main body 1 is connected to the top cover 2 through an intake throat pipe 8. As Figure 4 shown, the top cover 2 is a symmetrical structure. The left side of the top cover 2 is directly connected to the first air filter 3, and the right side is directly connected to the second air filter 4. A negative pressure valve 17 is provided at the bottom of the top cover 2, and an intake channel 15 is provided at the lower end of the middle part of the top cover 2 to connect to the intake throat pipe 8. The first air filter 3 and the second air filter 4 have the same structure and are symmetrically arranged. The buckled and connected upper cover 6 and lower cover 7 of the intake cavity are convenient for installation, disassembly and cleaning. Air enters the top cover 2 from the air filters on both sides, then enters the intake throat pipe 8 through the intake channel 15, and flows into the intake cavity main body 1 to complete the preliminary filtration of the intake air. When the internal air pressure of the top cover 2 is too high, the negative pressure valve 17 opens and the gas flows out from it. The difference between this embodiment and Embodiment 1 is that the top cover 2 is divided into two parts, an upper shell and a lower shell, and the two are fixedly connected by snap fasteners and bolts, which is convenient for production and installation.

[0028] As a further improvement of the present utility model, the right side of the first air filter 3 is integrally connected to the top cover 2, and an intake partition 9 fixed by bolts is provided on the left side. A filter net 10 is provided on the intake partition 9, and the filter net 10 is integrally connected to the intake partition 9. The left side of the second air filter 4 is integrally connected to the top cover 2, and an intake partition 9 fixed by bolts is provided on the right side. As Figure 6 shown, a filter net 10 is provided on the intake partition 9, and the filter net 10 is integrally connected to the intake partition 9. The design of the two air filters can ensure sufficient intake air volume while effectively filtering out impurities, dust, and particulate matter in the air. The integrally connected filter net 10 and intake partition 9 are convenient for installation and disassembly and cleaning. At the same time, the integral design of the top cover 2 and the air filter is convenient for production and installation. Bolt fixing structures 13 are provided at both ends of the intake partition 9 for installing and fixing the intake partition 9 on the air filter.

[0029] As a further improvement of the present utility model, a labyrinth partition 11 is provided on the lower cover 7 of the intake chamber. A bellmouth tube 12 is provided on the lower cover 7 of the intake chamber to connect to the intake pipe, and the intake pipe is directly connected to the engine. The difference between this embodiment and the first embodiment is that, as Figure 5 shown, a labyrinth partition 11 is also provided on the upper cover 6 of the intake chamber. The labyrinth partition 11 on the upper cover 6 of the intake chamber corresponds to the labyrinth partition 11 on the lower cover 7 of the intake chamber up and down. After the upper cover 6 and the lower cover 7 of the intake chamber are buckled and connected, they can be used as support and fixation to ensure the overall structural strength, and at the same time increase the sealing performance of the channel network formed by the labyrinth partition 11. When the engine is working, due to the gaps between the cylinder wall and the piston and piston ring, part of the mixed gas (including fuel, engine oil, water vapor, etc.) will enter the crankcase. In order to reduce the consumption of engine oil and the pollution of the intake system, it is necessary to separate the oil and gas so that the relatively clean gas can continue to enter the intake system to participate in combustion. A complex channel network is formed between the labyrinth partitions 11, so that the oil and gas mixture constantly changes direction when passing through, thereby increasing the chance of impact between the oil droplets and the labyrinth plate to achieve oil and gas separation. The separated gas enters the intake pipe through the bellmouth tube 12 and directly reaches the engine. The bellmouth tube 12 is a bell-shaped structure with a large front end and a small rear end. The large end intakes air and the small end discharges air, which can ensure that the gas after oil and gas separation flows out from it, while the oil droplets in the intake chamber are difficult to flow upstream into the bellmouth tube 12.

[0030] As a further improvement of the present utility model, different from the first and second embodiments, a large extended fixing plate 16 is provided on the upper cover 6 of the intake chamber. A variety of bolt interfaces are provided on the extended fixing plate 16, which can fix the present utility model on engines of different models, facilitating installation and realizing the wide application of the intake chamber of this engine.

[0031] The above specific embodiments are only preferred embodiments of the present utility model, and do not limit the specific implementation structure and scope of implementation of the present utility model. In fact, some equivalent changes can also be made according to the shape, structure and design purpose of the present utility model. Therefore, all equivalent changes made according to the shape, structure and design purpose of the present utility model should reasonably be included in the protection scope of the present utility model, that is, these equivalent changes should all be protected by the present utility model.

Claims

1. An engine intake cavity, characterized in that, It includes an intake cavity main body, on which a top cover is provided. A first air filter is provided on the left side of the top cover, and a second air filter is provided on the right side. Inside the intake cavity main body, there is a gas channel network composed of labyrinth partitions. The lower end of the intake cavity main body is connected to the engine through an intake pipe.

2. The engine intake cavity according to claim 1, characterized in that, The intake cavity main body includes an upper intake cavity cover and a lower intake cavity cover that are snap-connected, and the intake cavity main body is connected to the top cover through an intake throat pipe.

3. The engine intake cavity according to claim 2, characterized in that, The left side of the top cover is directly connected to the first air filter, the right side is directly connected to the second air filter, and a negative pressure valve is provided at the bottom of the top cover.

4. The engine intake cavity according to claim 1, characterized in that, The first air filter and the second air filter have the same structure and are symmetrically positioned.

5. The engine intake cavity according to claim 1 or 4, characterized in that The right side of the first air filter is integrally connected to the top cover, and an intake partition fixed by bolts is provided on the left side. A filter screen is provided on the intake partition, and the filter screen is integrally connected to the intake partition.

6. The engine intake cavity according to claim 1 or 4, characterized in that, The left side of the second air filter is integrally connected to the top cover, and an intake partition fixed by bolts is provided on the right side. A filter screen is provided on the intake partition, and the filter screen is integrally connected to the intake partition.

7. The engine intake cavity according to claim 2, wherein The lower intake cavity cover is provided with labyrinth partitions, and after the gas enters the intake cavity main body from the intake throat pipe, it directly enters the gas channel network composed of labyrinth partitions.

8. The engine intake cavity according to claim 2, characterized in that, The lower intake cavity cover is provided with a horn pipe to connect the intake pipe, and the intake pipe is directly communicated with the engine; the gas flows out from the gas channel network composed of labyrinth partitions in the intake cavity main body and then enters the intake pipe from the horn pipe.

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